Scaling application windows in one or more workspaces in a user interface

ABSTRACT

In some implementations, a method for managing virtual workspaces is described. In some implementations, workspace images corresponding to different virtual workspaces can be displayed on a user interface of a computing device. When an application window is moved onto one of the workspace images, the window can be scaled down to fit within the workspace image. In some implementations, a window grouping or cluster can be moved onto one of the workspace images and scaled down accordingly. In some implementations, a method for generating a new virtual workspace is described. In some implementations, a placeholder workspace image that has no corresponding virtual workspace can be displayed on a user interface of a computing device. In response to an application window being moved onto the placeholder workspace image, a new virtual workspace (and new workspace image) can be generated that includes the windows that were moved onto the placeholder workspace image.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Provisional Application No.61/444,897, filed on Feb. 21, 2011, entitled “Managing Workspaces in aUser Interface,” the entire contents of which is incorporated byreference.

TECHNICAL FIELD

This disclosure relates generally to managing virtual workspaces on acomputing device.

BACKGROUND

Modern graphical user interfaces allow a large number of graphicalobjects or items to be displayed on a display screen at the same time.Leading personal computer operating systems, such as Apple Mac OS®,provide user interfaces in which a number of windows can be displayed,overlapped, resized, moved, configured, and reformatted according to theneeds of the user or application. Taskbars, menus, virtual buttons andother user interface elements provide mechanisms for accessing andactivating windows even when they are hidden behind other windows.

As a result, most computers today are capable of running a great numberof different programs. This can be done by the computer executingsoftware code locally available to the computer or by connecting thecomputer to a remote application server, for example over the internet.Examples of application programs include mainly business-relatedsoftware such as records management programs and meeting organizationprograms, software that is used alternatively for business or personaluse, such as word processors or email applications, and software that ismainly intended for personal use such as online chat or music filemanagement programs.

With the large number of different applications available, users areencouraged to work with a multitude of items in their computers. Somecategories of items, such as files of a certain type, can be limited touse by a particular application program, while other item categories canbe compatible with several programs. Depending on the user's needs, heor she can need to use several different programs in a limited period oftime as part of a daily work routine or to accomplish a particular goal.As a result, users sometimes have several windows open on the computerdisplay at the same time.

However, with numerous windows open at once, the desktop can becomecluttered and difficult to overview. As a result, it can be difficultfor the user to find a particular application when needed. Further, thenumerous windows and running applications can be difficult to organizeand manage efficiently. For example, the user may have difficultyquickly identifying application windows that are associated with eachother. In some instances, the user may have multiple workspaces, eachworkspace with a different configuration of graphical objects such andapplication windows. The user may need to quickly move from oneworkspace to the next while also being able to dynamically make changesto a workspace as needed.

SUMMARY

In some implementations, a method for managing virtual workspaces isdescribed. In some implementations, workspace images corresponding todifferent virtual workspaces can be displayed on a user interface of acomputing device. Windows associated with a particular virtual workspacecan be displayed in an enlarged view that has a size that is greaterthan the workspace images. When a window is moved from the enlarged viewonto one of the workspace images, the window can be scaled down to fitwithin the workspace image. In some implementations, a window groupingor cluster can be moved from the enlarged view onto one of the workspaceimages and scaled down accordingly.

In some implementations, a method for generating a new virtual workspaceis described. In some implementations, a placeholder workspace imagethat has no corresponding virtual workspace can be displayed on a userinterface of a computing device. Windows associated with a virtualworkspace can be displayed on the user interface and a user can move oneor more of the windows onto the placeholder workspace image. In responseto the windows being moved onto the placeholder workspace image, a newvirtual workspace (and new workspace image) can be generated thatincludes the windows that were moved onto the placeholder workspaceimage.

The details of one or more implementations of managing items in a userinterface are set forth in the accompanying drawings and the descriptionbelow. Other features, aspects, and advantages will become apparent fromthe description, the drawings, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an exemplary user interface showing a bridgeinterface for viewing and managing virtual workspaces.

FIG. 2A illustrates an exemplary user interface showing reordering ofworkspace images.

FIG. 2B illustrates an exemplary user interface showing a transitionfrom one active workspace to a different workspace while in the bridgeinterface.

FIG. 2C illustrates an exemplary user interface showing a change in theworkspace associated with an application window.

FIG. 2D illustrates an exemplary user interface showing a creation of anew workspace using an appropriate drag and drop action.

FIGS. 2E-2F illustrate an exemplary user interface showing scaling ofapplication windows when performing drag and drop operations in thebridge interface.

FIGS. 3A-3D illustrate exemplary actions performed on a cluster ofapplication windows.

FIGS. 4A-4B illustrate an exemplary user interface showing creation of anew virtual workspace.

FIGS. 5A-5C illustrate an exemplary user interface showing display andnavigation of multiple desktop images in the bridge interface.

FIG. 6 is a flow diagram of an exemplary process for displaying a bridgeview of workspaces in a user interface.

FIG. 7 is a flow diagram of an exemplary process for changing thevirtual workspace associated with an application window.

FIG. 8 is a flow diagram of an exemplary process for changing from oneactive workspace to a different active workspace.

FIG. 9 is a flow diagram of an exemplary process for expanding a clusterof application windows.

FIGS. 10A-10C illustrate exemplary software architecture forimplementing the bridge interface processes described in reference toFIGS. 1-9.

FIG. 11 is a block diagram of exemplary hardware architecture forimplementing the user interfaces and processes described in reference toFIGS. 1-10C.

Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION Overview

Computing systems, such as personal computers, handheld devices, smartphones, gaming devices, portable computers, and so on, typically includehardware components such as a processing unit (e.g., one or moreprocessors), memory, and various input and output devices (e.g., adisplay, a keyboard, a mouse, a touch-sensitive surface). An softwareoperating system (O/S) can be installed on the computing system andexecuted by the processing unit to control the operations of thecomputing system.

Many operating systems and software applications employ graphical userinterfaces (GUIs) to present information to users and to receive userinput for controlling the behavior and functionality of the underlyingcomputing devices and/or application programs. A typical two-dimensionalGUI of an operating system can be described as a “desktop” metaphor.

Visually, a desktop of an operating system can provide a background(e.g., a desktop plane) on which other graphical objects, such as iconsrepresenting connected peripheral devices (e.g., disk drives, networkdevices, printers, etc.), installed programs, stored documents, openwindows of executing application programs, file system folders, and soon, can be presented. In addition, user interface elements that allowuser interaction with some aspects of the operating system can bepresented at various locations on the desktop as well. For example, athree-dimensional menu bar showing basic controls of the desktopenvironment, a system tray showing programs executing in the background,a docking station for shortcuts to frequently used application programs,and so on, can also be presented on the desktop plane.

An operating system of a computing device can often support a largenumber of active applications at the same time, and each of the activeapplications can have multiple open windows concurrently presented onthe desktop plane. The user can switch among the active applications andthe open windows by selecting (e.g., clicking on) the window he/shewishes to access. Upon user selection, the selected open window canobtain input focus and becomes the current active window (or “topwindow”) of the desktop. The user can interact with the current activewindow in a manner dictated by the application program providing theactive window.

The windows, icons, application components, taskbars, and othergraphical items currently displayed on the desktop are, in someinstances, components that a user has recently used or plans to use.When the number of application windows and graphical objects displayedon a desktop increases, the user may prefer to associate certainapplication windows with each other. For example, a user may prefer togroup together application windows that are related to the same task orapplication windows that have been or will be used within the same timeframe.

In some implementations, the graphical objects can be grouped togetherinto one or more virtual workspaces, or “spaces.” As used herein, aspace is a grouping of one or more applications, or windows, in relationto other applications or windows, such that theprogram(s)/application(s) of a single space is visible when the space isactive, and so that a view can be generated of all spaces and theircontents. Each space can depict a different desktop arrangement,including application windows, desktop images, icons, or other graphicalobjects that are displayed only when the associated space is active. Auser can focus a view of the windows in a particular selected space suchthat the windows are enlarged or brought forward in the GUI with respectto windows in unselected spaces. An application program can have morethan one window in a space, or an application can have windows in morethan one space, to name a few examples.

A bridge interface of the GUI can present an overview of the spacescurrently available to the user to allow the user to efficiently managethe different spaces. As used herein, a bridge view or bridge interfacecan be a display in a user interface of multiple virtual workspacesconcurrently with at least some of the application windows associatedwith one of the virtual workspaces. Thumbnail images can be displayed torepresent each space, providing a miniature representation of each spaceas the space would look if activated. In some implementations, eachthumbnail image is a live depiction of the status of application windowsassociated with the space represented by the thumbnail image. The usercan navigate and select the thumbnails to activate a particular spaceusing different user inputs. In the bridge interface, an activated spaceincludes presentation of application windows associated with the spacein an organized format, allowing the user to quickly identify and accessapplication windows sharing a common characteristic.

Exemplary User Interfaces for Viewing and Managing Desktops in a UserInterface

FIG. 1 illustrates an exemplary user interface 100, which can be adesktop of an operating system. The two-dimensional desktop plane hasthe appearance of being substantially co-planer or parallel to thedisplay surface of an underlying hardware screen. When an applicationexecuting in the operating system environment generates a new window,the window can be displayed on top of the two-dimensional desktop plane.The user interface 100 can include spaces presented in a bridge view 100of the desktops and applications in the present example. The depictionincludes elements which can be found in a display of a graphical userinterface and space elements, here a dock 130 for display of availableapplications, groups of open application windows (120, 122, 124, 126,128), system spaces such as a dashboard 104 or calendar 112, and severalindividual spaces (106, 108, 110) arranged in a row of thumbnails 103,each thumbnail representing a different space. A dashboard can be anapplication used for hosting mini-applications known as widgets. In someimplementations, a dashboard can be a semi-transparent layer that isinvisible to the user unless activated (e.g., by clicking an icon). Whenthe dashboard is activated, the user's desktop is dimmed and widgetsappear in the foreground. Widgets can provide functionality and/orinformation. The widgets can be moved around, rearranged, deleted andrecreated. In some implementations, dashboard widgets can be HTML filesthat are displayed within the dashboard.

Toolbars provided by applications or the operating system can be shownon a display of a computer. In some implementations, the toolbar ishidden from view during display of the bridge view 100. The toolbar caninclude items such as menus, icons, and informative objects. Some menuscan be general and not specific to a particular application, such as afile menu. Other menus can be application dependent, such as a terminalmenu, in which case they can be added to or removed from the toolbardepending on whether a corresponding application window is active. Ingeneral, an “active application window” refers to a program window thatis designated as the primary recipient of user input for input devicessuch as a keyboard, touchpad, or touch screen. The user, or a componentsuch as the operating system, can cause a different program window to bedesignated as the active program window within a given space. Icons canbe used to present information to the user, such as status information,and/or can be used to access functions via, for instance, popup menus orcommands for opening another application window. The display can alsoinclude a docking element 130, which provides an area where commonlyused or preferred applications can be easily accessed through selectionof icons included in the docking element 130, each icon associated witha different application.

A computer display with multiple spaces is shown, including a firstspace 106, a second space 108, and a third space 110. In the illustratedbridge view, the spaces are arranged in a row 103 near the top of thedisplay, with each space showing portions of a larger desktop which maybe zoomed, for instance, to show more detail. In some implementations,the row of spaces 103 can be arranged in different formats and differentlocations on the screen. For example, the spaces in row 103 can beseparated into different groups based on whether the space is a systemspace, such as dashboard 104, or a user-defined space. System spaces canbe displayed together in row 103 while user-defined spaces can bedisplayed adjacent the system spaces, for example. Each of the spaces isrepresented in the bridge view by a condensed representation of theapplication windows open within that space. In the illustrated example,space 106 is represented in the row of spaces 103 by a visual workspaceimage 106, or thumbnail image, comprising a miniaturized depiction ofthe application windows opened within space 106. In zoom mode, a singlespace can be active and presented with a larger size, with theapplication windows contained in the other spaces being hidden or onlypartially visible. An “active” space is a selected space having itscomponents readily available and visible for access by a user. While aparticular space is active, the visual components associated with otherspaces may be hidden from view. The spaces represent a desktop surfacelarger than what can be shown on display at once. Thus, applicationwindows are depicted in reduced size to be able to show all or most ofthe active windows in the space.

In certain implementations, a space can be dedicated to a particularapplication or arrangement of applications. For example, as depicted inFIG. 1, a space can function as a dashboard 104 of commonly usedapplications, such as a weather report, clock, calculator, or otherapplications designated as dashboard applications. Spaces can also bededicated for other uses, such as a calendar or planner as representedby space 112.

Each space can also be associated with a particular image such as adesktop wallpaper 170. A desktop wallpaper 170 functions as an imagedisplayed in the background of a desktop interface. Accordingly, inaddition to being associated with a group of open application windows,each space can be associated with certain display settings, such as aparticular desktop image to be displayed in the background when thespace is activated. In this instance, each space functions as its owndesktop, and a user can personalize each space by determining thebackground image, the application windows used, or other settings for aparticular space according to the user's preferences.

One or more application windows can be arranged in multiple ways withina space. Application windows can be positioned such that they fully orpartially overlap one another. They can be resized or moved around inspaces to accommodate the user. Particularly, while many windows can beopen at once and distributed among the spaces, in some implementationsonly the application window(s) in a particular space will be visiblewhen that space is active. In some instances, programs or windows fromanother space that is not currently activated can be visible. Forinstance, in the bridge view 100 depicted in FIG. 1, all availablespaces can be shown in an organized arrangement such as the row ofspaces 103. In other instances, a small representation of another spacecan be visible on the display apart from the bridge view to achieve a“picture-in-picture” effect. In some cases, an application or window canbriefly appear even if its space is not being displayed; for example,some events such as finishing a task can cause a program window toappear for a limited time or until a user dismisses the window.

When a space is activated, the application windows of the activatedspace are restored to their original positions before entering thebridge view 100. The display can exit the bridge view 100 in someimplementations and present only the contents of the activated space.The background image associated with the space is displayed as thedesktop wallpaper. When the bridge view 100 is displayed, theapplication windows for a space are grouped or clustered together inavailable areas of the screen. In certain instances, each grouping ofwindows includes all application windows or application instancesassociated with a particular application for a particular desktop.Further, each grouping of windows can be described as a “cluster” ofapplication windows. The grouping of windows can also be based on othershared characteristics, such as windows that are associated withdifferent applications but are similar in functionality. For example,several web browser windows may be open in a particular space. If thespace is activated, the windows within the space are enlarged as if theyare pulled into the forefront of the display. Each of the web browserwindows in the space can be grouped together in a certain region of thescreen, forming a cluster of web browser windows. Each cluster ofwindows can be associated with an icon indicating the particularapplication associated with the windows in a certain cluster of windows.Accordingly, a user can identify, based on the icon displayed in theregion of a particular cluster of windows, the types of windows found inthe cluster. Still further, a user can optionally select applicationwindows to group together as a cluster regardless of whether theapplication windows share a common characteristic or are associated withthe same application.

In some implementations, a user can select a particular window ordocument from the bridge interface view to display the window fullscreen. In certain instances, the user's selection of a particularwindow will trigger full-screen display of only the selected window.Alternatively, selection of a particular window from the bridgeinterface view can trigger display of the particular applicationassociated with the selected window and all windows or documentsassociated with the application. Further, a group of application windowsor documents comprising a subset of all the application windowsassociated with the particular application associated with the selectedwindow can be displayed. The determination of whether a single window ordocument, all windows associated with an application, or a subset of thewindows of the application are displayed can be based on variousfactors, including user preferences, the type of application (e.g.,document-based application), or relationship between applicationwindows, for example. Further, related application windows of otherapplications can also be activated for full-screen display based on thecontext of the application windows.

In the illustrated example, space 106 is currently selected. As seen inFIG. 1, each grouping of application windows (120, 122, 124, 126, 128)associated with space 106 is depicted in the selected desktop for space106. Further, each grouping of application windows can include openapplication windows for a particular application or that share a commoncharacteristic. For example, application windows associated with a webbrowser can be grouped together in one cluster 128, and an icon 128 acan be displayed in the vicinity of the cluster 128 to allow a user toquickly determine that the application windows in cluster 128 areassociated with a web browser application. A separate icon 128 bassociated with the web browser application can also be depicted in adocking element 130 for easy opening of additional windows of the webbrowser application. Similarly, each cluster in space 106, such asclusters 120, 122, 124, and 126, is associated with a differentapplication. In some implementations, the clusters are displayed suchthat no window of any cluster overlaps with any other window of adifferent cluster. As depicted in FIG. 1, each of the clusters is agrouping of application windows associated with particular applicationsthat a user can select from a docking element 130. The docking element130 includes icons (120 b, 122 b, 124 b, 126 b, 128 b, 180, 190) foreach application available to a user. In some implementations, the dock130 is displayed in the user interface regardless of the space that iscurrently active, allowing a user to navigate the dock 130 withoutlosing the selected space.

Each cluster of windows can contain windows that have been reduced insize to group the windows associated with the same application togetherin the same region of the GUI. In certain implementations, theapplication windows across all clusters are reduced in size by the samescale factor to maintain the relative proportionality of the spaces. Ifa particular cluster has been activated, or if a specific window withinthe cluster is selected, the window(s) can be expanded to a larger size.If multiple windows are grouped in a cluster, they can be arranged in aparticular order, such as in a cascading or overlapping arrangement. Insome implementations, an ordering algorithm can be used to determine aparticular order for the arrangement of windows in a cluster. Forexample, the ordering algorithm can use various heuristics, settings,user preferences, or other parameters to determine an order to arrangethe windows in a cluster. The parameters used by the ordering algorithmcan include, for example, the dimensions associated with each window,the type of window, how recent a window was accessed relative to otherwindows in the cluster, how recognizable a part of the window is,empirical data related to a user's preferences, and other factors usedto determine an appropriate arrangement of the windows in a cluster.Further, within each cluster, the windows can be arranged such thatwindows with the highest priority are displayed with the most exposedareas compared to windows of lower priority. The priority of each windowcan depend on various factors such as how recently the window wasaccessed by the user, for example. For example, in a cluster of multipleapplication windows, a particular window that a user most recentlyinteracted with (e.g., clicked on) may be designated as the activewindow in the cluster. In some implementations, windows in a cluster aregrouped together in an area of the GUI and not necessarily stacked oroverlapping. The clusters of windows can be grouped in a particular areabased at least in part on where the windows were located in the GUIbefore the windows were clustered.

The bridge view shown in FIG. 1 allows the user to see the availablespaces and choose which space to use. In some implementations, a usercan transition into or out of the bridge view through a particular userinput, such as a keyboard input, a particular gesture on a touchpad, aselection using an input device such as a mouse, or any otherappropriate user input. When in the bridge view mode, applications cancontinue to run and program windows can be displayed in a normalfashion, for example on a smaller scale. Program windows can continue toupdate, for example, displaying animations, refreshing their contents,etc. The continuous updating of application windows can be shown in boththe thumbnail images in row 103 and the clusters of windows in thebridge view 100. In a sense, the bridge view 100 mode provides a visualoverview of all spaces and the applications and visual settings withineach space to a user. Users can navigate between spaces with appropriateuser input, such as by mouse, keyboard hot keys, key combinations,gestures, or other mechanisms. Other devices can also be used for input,such as those for providing alternate input capability for physicallyhandicapped users. It can be possible for the user to zoom in on asubset of spaces. In one implementation, the system can automaticallyswitch from one space to another based on a predefined event, such aswhen a specific application is launched or an application makes aparticular output.

Exemplary Actions for Managing Spaces in a Bridge View

FIGS. 2A-D depict example screenshots 200, 250, 280, and 290 ofdifferent actions performed on spaces in a bridge view. For example, asillustrated in FIG. 2A, the spaces in the bridge 203 can be rearrangedby a user or automatically by a computer application. In the illustratedexample, the spaces are initially arranged in a particular order, with adashboard space 204 at the far left, then a first space 206, a secondspace 208, a third space 210, and a calendar application 212 at the farright. A user can optionally rearrange the order of the spaces using anappropriate user input. For example, the user can execute a drag anddrop action using a mouse or touchpad to re-locate spaces displayed inthe row of thumbnails 203. Many operating systems enable a drag and dropoperation to be performed on items that are currently selected in a GUI.In the drag and drop operation, representations of the selected itemscan be moved (or “dragged”) in the user interface from one area of a GUIto another area of the GUI following the movement of a pointer (e.g., amouse cursor or pointing device on a touch-sensitive surface). When theitems are released (or “dropped”) over the drop zone of a desired targetarea, the selected items become the content items of the desired targetarea.

In the illustrated example, a user can drag and drop a space 208 fromone location and insert the space into a different area, such as betweendifferent surrounding spaces. In certain implementations, however, somespaces are moveable and some are fixed. For example, a particulardesktop such as space 206 can be designated as a default space andremains fixed in the row of thumbnails 203. As seen in FIG. 2A, space208 can be extracted from an original position between spaces 206 and210, and inserted further to the right between spaces 210 and 212. As auser navigates the row of spaces 203, a pointer or other indicator ofinput sliding over a particular space thumbnail can trigger an animationthat temporarily enlarges the space thumbnail to allow a user to viewthe contents of the space in greater detail, while the surroundingspaces shrink in size to accommodate the temporary enlargement. If thespace is moved to a new position already occupied by another space, theother space can be automatically relocated to make room for the movedspace. Also, the relocated space or one or more other spaces can beadjusted to fill the vacated space position. In some implementations,the animation of rearranging space 208 can include a depiction of space208 being pulled from its original location by a cursor controlled by auser, following the cursor as the cursor moves to a different area ofthe screen, and detaching from the cursor onto a region of the screenafter the user has entered an input such as releasing a button on aninput device. Here, space 208 is moved between spaces 210 and 212, andspace 210 shifts to the left to assume space 208's original position inthe row 203. A user can also specify a preferred way to handle spacemovements.

Other operations can be performed on a space such as, for example,renaming a particular space or selecting a new wallpaper for a space.

FIG. 2B illustrates an example screenshot of a transition from oneactive space to a different active space. In certain implementations, auser can activate a first space and then seamlessly transition from thefirst space to a newly activated second space. For example, when a useractivates a space, such as space 206 in FIG. 2B, the clusters ofapplication windows and the desktop wallpaper associated with space 206are displayed in workspace 260. Here, the application windows anddesktop wallpapers associated with spaces that are not currentlyactivated are not displayed in the main workspace 260 of space 206(although condensed versions of those application windows and desktopwallpapers may be seen in the thumbnail images in the row of images 203representing different spaces, such as images of spaces 208 and 210).

The user can select a different space, such as space 210, for activationusing an appropriate input. In some instances, a user can select space210 for activation by clicking on the image representing space 210 inthe row of thumbnails 203 using a cursor or finger on a touchscreen,entering a particular input on a keyboard, or using a particular gesturewith the user's fingers on a multi-touch input device. The particulargesture can include a swipe of the user's fingers across the multi-touchinput device, for example. The user's selection of space 210 foractivation causes a deactivation of space 206 before activation of theworkspace 270 associated with space 210. The transition can beillustrated using any appropriate animation. For example, as illustratedin FIG. 2B, the transition can be depicted as a sliding of workspacesacross the screen. The animation can include sliding the workspace 260being deactivated off the screen to the left as the newly activatedworkspace 270, including the desktop wallpaper and cluster ofapplications associated with selected space 210, slides onto the screenfrom the right. The direction of the sliding workspaces can correspondto the relative positions of the spaces in the row of thumbnails 203. Inthe present example, the newly activated space 210 is located to theright of the previous space 206, so the sliding motion of the workspaces260 and 270 is from right to left.

The switch from one space to an adjacent space can be accomplished usingdifferent gestures on a multi-touch input device. In someimplementations, a user can perform a swiping gesture on a multi-touchinput device in a direction from right to left in order to switch acurrently active space to a space represented by a thumbnail image tothe right of the thumbnail representing the currently active space.Alternatively, a user can perform the swiping gesture from left to rightin order to switch a currently active space to a space represented by athumbnail image to the left of the thumbnail representing the currentlyactive space.

Further, as seen in FIG. 2B, the newly activated space 210 isrepresented by a thumbnail that is adjacent to the previous space 206.Accordingly, the animation includes transitioning from one workspace 260directly to another workspace 270. In certain implementations, a slidinganimation can also be used for transitioning between two spaces that arenot adjacent to each other in the row of thumbnails 203, such astransitioning directly from space 208 to space 210, for example. In thisinstance, some detail from the desktops of spaces between the two spacescan be included in the animation to depict the spatial relationshipbetween spaces and from one active space to another active space.Accordingly, a transition from space 208 to space 210 in the illustratedexample can include an animation showing details from space 206 slidingacross the entire screen between the animations of space 208 sliding offthe screen and space 210 sliding onto the screen.

FIG. 2C depicts another example action that can be performed duringmanagement of desktop spaces. A user can create a space with an initialarrangement of application windows, icons, or desktop wallpaper. Theuser can then change the contents or appearance of the space usingvarious inputs. For example, a user can move an application window or anentire cluster of windows from one space to another or associate theapplication window with a different space. This change can be initiatedby the user, for example, because the application window is to be usedin connection with the applications(s) already present in the otherspace. In the illustrated example, a currently active space 206 caninclude a particular application window 282 that a user wants to move toa different space 210. The user can select the application window 282and, using an appropriate motion such as a drag and drop operation,transfer the application window 282 to a different space 210 by droppingthe application window on the thumbnail image representing space 210.The application window 282 selected by the user can be one applicationwindow, multiple application windows from the same cluster, or an entirecluster of application windows. In some implementations, a new instanceof the window is created in space 210 as window 284 while in otherinstances a copy of the application window is formed in space 210 whilethe original window 282 remains in space 206. While the above exampledescribes a single application window being moved, other moves are alsopossible in some implementations. For example, it can be possible tomove all windows of a type, all windows of a single application, or aselection of windows. In some implementations, some changes to spaces,such as moving content from one space to another, can be done in thebridge view or a zoom-in mode.

FIG. 2D depicts an example of creating a new space using an appropriateinput such as a drag and drop operation. In the bridge view 290, a usercan select an application window 282 and drag and drop the applicationwindow to a location 292 in between two other spaces 208 and 210. Insome implementations, this operation automatically triggers creation ofa new space containing application window 282, with the thumbnail imageof the new space located at 292 between spaces 208 and 210.

The user can signal his or her intentions to transfer an applicationwindow using a menu, icon, popup menu, gesture, hot-key or keycombinations, to name some examples. The application window to be movedcan be selected, in some implementations, via mouse clicks or gestures,combinations of button presses such as tabs or arrows, or combinationsthereof. Various methods of moving the application windows can be used,such as by using a mouse to drag the application window from theoriginating space and drop it into the destination space, or usingkeyboard commands to reposition the application window into thedestination space.

Further, the arrangement of desktop spaces relative to each other can bebased on various algorithms. As described above in relation to FIG. 2D,a user can specifically designate the location of a space relative toother spaces, such as by dragging and dropping desktop components onto aparticular location in the row of desktop thumbnails 203. In certaininstances, however, the location of a newly created desktop spacerelative to other spaces can be determined automatically. For example, auser can create a new desktop by entering a particular input. The newdesktop is generated and then automatically placed at a location basedon the location of the desktop most recently used by the user. In thebridge view, the location of the new desktop is represented in the rowof thumbnails 203 with a new desktop image adjacent to the appropriatedesktop images based on the location of the new desktop.

Turning to the illustrated example in FIG. 2D, a user may be currentlyworking on an application in desktop 206. The user may then, forexample, open a new application and create a new desktop to contain thenew application. The location of the new desktop can be automaticallydetermined based on the user's most recently used application. In thepresent example, the user was previously working on an application indesktop 206, so the new desktop can be automatically generated adjacentto desktop 206 (e.g., between desktop 206 and desktop 210).Alternatively, the most recently used desktop 206 can be moved to a newlocation associated with the new desktop (instead of automaticallydetermining the location of the new desktop). For example, if the usercreates a new desktop and specifically indicates that the new desktopwill be located between desktops 210 and 208, the most recently useddesktop 206 may be automatically moved adjacent to the new desktop basedon the recent usage of desktop 206. Accordingly, the user can easilyswitch between the two most recently used desktops because they arelocated adjacent to each other.

In some implementations, in addition to automatically determining thelocation of new desktops, the location of existing desktops can also bedetermined automatically. In some implementations, the location ofdesktop spaces can be automatically changed based on input received froma user, such as when a user switches to a different desktop space via anappropriate input (e.g., clicking on a particular application icon inthe dock or entering a tab command to switch to a differentapplication). For instance, a user may be currently using applicationslocated in desktop 206 and desktop 208 and frequently switch between thetwo desktops. As seen in FIG. 2D, desktops 206 and 208 may not belocated adjacent to each other initially. Due to the frequent use of theapplications in these two desktops 206 and 208, however, the location ofdesktops 206 and 208 may be automatically adjusted such that they areadjacent to one another. Accordingly, the user's input for switchingbetween desktops can be simplified. For example, in someimplementations, a user can switch directly from one active desktop toan adjacent desktop through a simple gesture input on a multi-touchdevice without accessing the bridge view. Switching from one desktopspace to a directly adjacent desktop space can require fewer or simplerinputs than switching to non-adjacent desktops, and automaticmodification of desktop locations can simplify a user's navigation ofdesktop spaces.

Various algorithms or constraints can be implemented when automaticallydetermining the location of a new desktop relative to other desktops. Insome instances, for example, two desktop spaces may always be locatedadjacent to each other such that automatic determination of the locationof other desktops will not interfere with the two desktop spaces. Inother instances, the most frequently used desktops can be located at aparticular end of the row of thumbnails 203 for easy access. In otherwords, automatic placement of desktop spaces can be based on anysuitable algorithm or factor, such as based on the types of applicationsrunning in the desktop spaces, the visual appearance of desktop spaces,preferences or habits specific to a particular user or generalpreferences across a plurality of users, the importance of certaindesktops, or the level of cross-desktop activity associated withparticular desktops.

FIGS. 2E-2F depict an example of automatic scaling of applicationwindows during management of desktop spaces. As described above inrelation to FIG. 2C, in the bridge view, a user can move a particularapplication window or cluster of windows from an active desktop space toa different desktop by dragging and dropping the application window ontoa thumbnail image of the target desktop in the bridge view, for example.The normal size of the selected application window, however, may be toolarge and prevent a user from identifying the particular target desktopwhen the application window is moved in the vicinity of the desktopimages in the bridge view. As seen in FIG. 2E, the application window284, in view of its original size represented by the outlined object 284a, may cover up the desktop images in the row of thumbnails 203 due toits size when a user drags the application window 284 over the desktopimages.

In some implementations, when the user selects application window 284 ora cluster of windows associated with application window 284 and dragsthe window near the desktop images, the selected application window 284(or cluster of windows) can be scaled down in size to allow the user tosee each of the desktop images clearly, as seen in FIG. 2F. The scalingof the selected application window 284 can be based on the location ofthe application window with respect to the row of desktop images 203.For example, the application window 284 can initially be displayed inits normal size in the bridge interface view, as represented in theoutlined object 284 a. As the user drags the application window 284 nearthe row of desktop images 203, such as after the application window 284crosses a certain threshold, in order to drop the application window 284onto desktop 208, the application window 284 may progressively decreasein size as it nears the desktop images 203, as seen in FIGS. 2E-2F. Inother words, the scaling of the application window 284 can be based onthe location of the application window 284 with respect to the desktopimages in row 203. The scaling of application window 284 can also bebased on other factors. For example, in some implementations,application window 284 is not scaled down in size until after the userdrags the window 284 over the desktop images and hovers the applicationwindow 284 there for a certain amount of time. Further, a cluster orgroup of application windows can be selected and automatically scaleddown in size when dragged toward row 203.

Exemplary Actions for Managing Windows in a Cluster

FIGS. 3A-D depict example actions for managing clustered applicationwindows in the bridge view. As described above in connection with FIG.1, application windows sharing at least one common characteristic can begrouped together in a cluster 300 based on the common characteristic.Each cluster can include application windows from the same space thatshare the common characteristic. In some implementations, however, auser can link application windows from other spaces that share the samecharacteristic as well. In some implementations, each application windowin a particular cluster represents different instances of the sameapplication. Alternatively, each application window in a particularcluster can represent instances of different applications that share atleast some common functionality. For example, application windowsassociated with different applications that share common functionality,such as word processing, electronic mail, web browsing, file browsing,system utility, spreadsheet manipulation, drawing, digital photomanipulation, system utility, or instant messaging, for instance, may begrouped together in a cluster, even if the application windows representinstances of different applications.

As illustrated in FIG. 3A, each of the application windows 302, 304,306, and 308 can be grouped together in close proximity to each other.The application windows that are grouped together can be currently openwindows in the respective spaces or windows representing recently closedwindows and displaying an image of the last known appearance of theclosed window. In some instances, the application windows are visuallypresented as a stack of overlapping windows, each of the overlappingwindows having different associated z-depths, while in other instances,the application windows are in close proximity but not overlapping. Theparticular arrangement of application windows in a cluster can be basedon various factors such as user preferences, common practices across acommunity of users, visibility of the different windows, or otherpotential factors. In FIG. 3A, the application windows 302, 304, 306,and 308 are visually presented as a stack of overlapping windows in acluster. In some implementations, each of the application window centerpoints can be aligned.

The application windows in FIG. 3A can also be displayed with a visualindicator 310 of the common characteristic shared among the applicationwindows in the cluster 300. The visual indicator 310 is, in someinstances, an icon 310 depicting a visual representation of the commoncharacteristic associated with the cluster 300. For example, if thecommon characteristic of the application windows in the cluster 300 isthat the application windows are all instances of a specific web browserapplication, the standard icon typically used to represent the webbrowser application can be used as the common characteristic indicator310 here. If the common characteristic of the application windows is acommon functionality, such as application windows associated withperforming photo editing, an icon 310 of a camera, for example, can beused to denote that the application windows in the cluster are relatedto photo editing.

A user can perform one or more actions to expand the cluster 300 ofapplication windows so that the application windows are more visible tothe user. In certain implementations, the user can click on theindicator 310 using a pointer 312 associated with an input device toexpand the application windows in the cluster 300, as depicted in FIG.3B. After the user performs the action for expanding the cluster 300,the application windows 302, 304, 306, and 308 can be visually shiftedin a radial direction away from a center point where the centers of theapplication windows were formerly aligned so that the user can view thecontents of the application windows. Further, the dimensions of some orall of the application windows can be increased as the applicationwindows are moved away from the cluster 300. In some instances, theapplication windows of a cluster 300 that has been expanded can cover upapplication windows in other clusters that have not been expanded.Further, application windows in other clusters can further be“de-emphasized” by being shifted toward the edges of the GUI or darkenedrelative to the cluster currently being expanded.

In some implementations, the application windows are expanded from thecenter point of the cluster 300 in a single step such that theapplication windows transition from their overlapping positions as seenin FIG. 3A to their respective separated positions in FIG. 3C. Theapplication windows of a cluster can be displayed in expanded mode suchthat no window of the cluster overlaps with any other window of thecluster as seen in FIG. 3C. In some instances, the dimensions of theapplication windows can be reduced to achieve display of the applicationwindows in such a non-overlapping manner.

The application windows can also shift away from the center of thecluster 300 in increments such that, at each increment, more of eachapplication window is visible to the user as seen in FIG. 3B. In certainimplementations, a user can enter successive iterations of input toeffect a spreading apart of the application windows in the cluster 300in increments, the application windows spreading in a radial directiongradually at each increment. In some instances, the user may not want tospread the application windows completely apart and may only want toobtain a glimpse of the contents of the application windows in a clusteras depicted in FIG. 3B. The user can enter an appropriate input, suchhovering a cursor over the cluster or entering slight gestures ormovements around the cluster, to effectively cause the applicationwindows to move slightly apart from each other, giving the impressionthat the cluster of application windows was nudged by the user. In someimplementations, a user can also identify a specific application windowfrom a cluster of windows to be displayed in full in the GUI. Forexample, a user can click directly on a titlebar of the applicationwindow to separate the window from the cluster to allow the user to viewthe complete window.

Different types of user inputs can be used to effect the visualmanipulation of application windows in a cluster 300. User inputsassociated with a cursor, such as drag and drop operations, can be usedto effect visual movement of the application windows. In anotherexample, a user can also gradually spread apart the application windowsby hovering a cursor associated with a mouse or touchpad, or a finger inconnection with a multi-touch input device, over the clusteredapplication windows. A user can also spread apart application windowsusing a scrolling motion with the user's fingers, for example. Thespreading apart of the windows can be based on the speed or repetitionof the user's scrolling. For example, an upward scrolling motion usingthe fingers can trigger the spreading apart of application windows in acluster while a downward scrolling motion can trigger collapsing of theapplication windows in the cluster. Further, on a multi-touch inputdevice or touch screen, a user can use two fingers in contact with theinput device to simulate a spreading motion using the tips of the user'sfingers, for example. As the user's fingers move away from each otherfrom a central position with the fingers in close proximity to oneanother to an expanded position, the application windows in the clusterspread apart in proportion to the relative distance between the fingers.

FIG. 3C is a visual depiction of the action of combining applicationwindows in a cluster or reversing the spreading of the applicationwindows described above in connection with FIG. 3B. The contraction ofthe application windows 302, 304, 306, and 308 back into a cluster canoccur automatically when a different cluster is selected for expansionor when a different space is activated. In certain instances, however, auser can initiate the collapse of the application windows into a compactgrouping using inputs similar to those described above in connectionwith FIG. 3B. For example, a user can move a cursor 312 to click on thecommon characteristic indicator 310 or other area of the user interfaceto effect the collapse of the application windows. The applicationwindows then shift inwardly toward a center point from their originalpositions so that portions of the application windows are nowoverlapping. Further, the application windows in a cluster can becollapsed automatically in response to a user's selection for expansionof application windows in a different cluster.

Exemplary Actions for Creating a New Desktop Space

FIGS. 4A-B illustrate example configurations for creating new desktopspaces. In FIG. 4A, a user can generate new spaces using an appropriateuser input such as by clicking on or selecting an icon 410 displayed onthe desktop or entering a particular input on a keyboard or a gesture ona multi-touch input device, for example. In some implementations, a newthumbnail image representing the new space 414 can be automaticallycreated after the user opts for creation of the new space. Further, aconfiguration tool 420 can be displayed to provide options for a user toenter a name 422, theme 424, or wallpaper 426 for the new desktop space414. A new desktop space can also be created automatically when anapplication is launched into full screen mode, a user selects fullscreen mode from within an application, or the user creates a newapplication window.

A new desktop space can also be configured upon creation without theconfiguration tool 420. For example, if a particular application windowis already open in a different space, a user can access the applicationwindow and explicitly tag the window for insertion into the newlycreated space 414. The user can also drag and drop the applicationwindow onto the thumbnail image representing the new space 414 toinclude the window in the new space 414.

FIG. 4B illustrates another configuration for generating new desktopspaces. In some implementations, a thumbnail image 414 a for creating anew desktop is displayed as one of the thumbnail images in the row ofspaces 403. The “new desktop” thumbnail image 414 a can be displayedcontinually to allow a user to easily create a new desktop space at anytime. Alternatively, the “new desktop” thumbnail image 414 a can bedisplayed in response to receiving a user input indicating possiblecreation of a new desktop space. For example, the new desktop image 414a may be automatically displayed in row 403 in response to a userinitiating a drag operation on an application window or cluster ofwindows, which may potentially be dragged and dropped at the “newdesktop” image 414 a to create a new desktop.

A user can select the “new desktop” thumbnail image 414 a to triggercreation of a new desktop. In certain instances, the user can click onthe new desktop thumbnail image 414 a, which may trigger differentactions with respect to generating a new desktop. For example, a usermay be using a particular application, and after the user clicks on thenew desktop image 414 a with a pointer 412, a new desktop is createdthat automatically contains the application currently used by the userand any windows associated with the application. In other instances, anew desktop may be created without any applications or windows containedwithin.

The new desktop thumbnail image 414 a can also act as a placeholder fora new thumbnail image representing the newly created desktop in region403. After the user clicks on the new desktop thumbnail image 414 a, anew desktop is created, and a visual representation of the new desktopis included in a new thumbnail image at the location of the new desktopicon 414 a in the row of spaces 403. As seen in FIG. 4B, the new desktopthumbnail 414 a can be located, for example, at the far right end of therow of spaces 403, and as each new desktop is added to the row 403, theexisting spaces displayed in the bridge view in row 403 are shifted tothe left to accommodate the new desktop. New desktops can also beinserted into the row of spaces 403 at other locations according to theuser's preferences. For example, a user can drag and drop the newdesktop image 414 a to a different location in the row of spaces 403such that each new desktop created will be inserted into the row 403 atthe location of the new desktop image 414 a. In some implementations, anew desktop image 414 a is always available in the row of spaces 403 toallow a user to easily create a new space. Alternatively, the newdesktop image 414 a can be hidden from view until needed by a user oruntil a particular input is received indicating a new desktop is to becreated.

Exemplary Configuration for Navigating Desktop Spaces

FIGS. 5A-5C illustrate an example configuration for navigating desktopspaces in a bridge view. In some implementations, a bridge view ofexisting desktop spaces is presented in a row of images 503, with eachimage representing a condensed, visual depiction of the applications,windows, and visual settings of each open desktop. Accordingly, a usercan view the components contained in all the existing desktops andobtain a general idea of what is included in each of the desktops foreasy navigation from one desktop to another. In some implementations,the images in row 503 can be presented in varying sizes to accommodatethe amount of visual components displayed in the bridge view 500. Forexample, as the number of desktop images displayed in row 503 increases,the size of each image displayed in row 503 may decrease in order to fitthe desktop images within row 503 or within a particular region of theuser interface.

As the size of the desktop images decreases, however, the detailsvisible to the user may become harder to view. Accordingly, some of thedesktop images may be enlarged based on the location of a user inputindicator, such as pointer 512, or on other user inputs. Turning to theillustrated example, FIG. 5A depicts a bridge view 500 with desktopimages 502, 504, 506, 508, 510, 514, and 516 displayed in a row 503.Here, the desktop images are displayed in a particular size. In someimplementations, a user can move the pointer 512 near one of the desktopimages in order to view a particular one of the desktop images in moredetail. As seen in FIG. 5B, as the pointer 512 is moved within thevicinity of desktop image 504, desktop image 504 is enlarged relative tothe other desktop images in row 503. Each of the visual componentsrepresented in desktop image 504 can also be enlarged accordingly inorder to allow a user to view the components in the desktop representedby desktop image 504 in greater detail. Any text associated with thedesktop image, such as labels of the desktop images, can also be scaledas appropriate. Further, as certain desktop images are enlarged, theenlarged desktop images may remain aligned with the other desktop imagesalong the same axis. As illustrated in FIG. 5B, each of the desktopimages 502, 504, 506, 508, 510, 514, and 516 are aligned along a centralaxis even though some of the desktop images are enlarged while othersare condensed. Alternatively, the desktop images can remain alignedalong a different axis, such as along the top or bottom edge of thedesktop images.

In some implementations, the desktop images adjacent to image 504,including desktop images 502 and 506, are also slightly enlarged to acertain degree to provide an impression of being “raised” relative tothe remaining desktop images. Accordingly, as the pointer 512 moves fromone desktop image to another, the desktop images near the pointer 512are enlarged in size based on their vicinity to the pointer 512, givingan animated ripple effect as the pointer 512 moves over particulardesktop images in row 503. As seen in FIG. 5C, the pointer 512 can bemoved across row 503 to hover over a different desktop image 510, whichresults in desktop image 510 being enlarged along with adjacent desktopimages 508 and 514 based on their distance from desktop image 510. Themovement of the pointer 512 away from desktop image 504 also triggersthe return of desktop image 504 to its original size, as depicted inFIG. 5C.

Exemplary Processes for Presenting a Bridge View of Desktop Spaces in aUser Interface

FIG. 6 is a flow diagram of an exemplary process 600 for displaying abridge view of desktop spaces in a user interface. In the exemplaryprocess 600, workspace images are presented in a user interface (610).The workspace images can be images corresponding to different virtualworkspaces available to a user of a computer system. For example, theworkspace images can be thumbnail images that depict a condensed livesnapshot of the application windows, desktop configuration, and othergraphical objects present in each virtual workspace. Each thumbnailimage displayed in the user interface can correspond to a differentvirtual workspace.

The virtual workspace can be conceptualized using a “desktop” metaphor,and accordingly, the virtual workspace is a desktop space or, simply, aspace. A user input is received indicating a selection of a presentedworkspace image (620). The user can select a particular workspace imageto activate the space represented by the image. In some implementations,a plurality of workspace images are presented to the user, allowing theuser to navigate the images and select a particular image to access thecontents of a space associated with the image. The user input forselecting a particular space can include, for example, using a cursor toclick on the workspace image associated with the particular space, akeyboard input, or predefined gestures using a multi-touch input device.

After selection of a workspace image, application windows associatedwith the selected workspace are grouped into clusters based on a sharedcommon characteristic of the application windows in each cluster (630).The shared common characteristic of application windows in a cluster canbe a same application associated with the windows in the cluster. Insome instances, application windows that are instances of differentapplications but share a common functionality can be grouped together asa particular cluster.

The user interface is updated to display application windows associatedwith the selected workspace as visually grouped clusters (640). Eachcluster of application windows can be visually depicted such that a usercan efficiently differentiate application windows associated withdifferent shared characteristic. For example, the application windows ineach cluster can be visually depicted within close proximity of oneanother and separate from application windows of other clusters.

FIG. 7 is a flow diagram of an exemplary process 700 for changing thevirtual workspace associated with an application window. A virtualworkspace associated with a workspace image can be activated anddisplayed to a user, the display including presentation of one or moreapplication windows. If a user has selected at least one applicationwindow in the displayed virtual workspace (710), the user can drag theselected application window to a new location (720). If the new locationcoincides with a workspace image different from the workspace imageassociated with the displayed virtual workspace (730), the virtualworkspace associated with the selected application window is changed tocorrespond to the virtual workspace associated with the differentworkspace image (740).

FIG. 8 is a flow diagram of an exemplary process 800 for changing fromone active workspace to a different workspace. An active workspace canbe presented to a user in a user interface. The user can perform aninput (810) that matches a predetermined gesture (820). If the user'sinput matches the predetermined gesture, the currently active workspaceis changed to another workspace (830).

FIG. 9 is a flow diagram of an exemplary process 900 for expanding acluster of application windows. A plurality of application windows canbe grouped together in a cluster based on a shared commoncharacteristic. The cluster can be initially depicted in the userinterface as a group of application windows in close proximity to eachother, some of which can be overlapping. An appropriate user input isreceived to separate the application windows in the cluster (910). Ifthe received user input indicates selection of a displayed cluster(920), the user interface is updated to display the application windowsof the selected cluster such that no window overlaps any other window(930). If one or more application windows are too large to preventoverlap after updating of the user interface (940), the dimensions ofone or more application windows of the selected cluster can be reducedso that the application windows do not overlap.

The above processes are merely examples. Various combinations of theabove processes are possible.

Exemplary Software Architecture

FIG. 10A is an exemplary software architecture 1000 for implementing theprocesses and user interfaces described in reference to FIGS. 1-9. Insome implementations, the program modules implementing the processes canbe part of a framework in a software architecture or stack. An exemplarysoftware stack 1000 can include an applications layer 1002, frameworklayer 1004, services layer 1006, OS layer 1008 and hardware layer 1010.Applications (e.g., email, word processing, text messaging, etc.) canincorporate function hooks to an accessibility API. Framework layer 1004can include bridge view UI modification engine 1012. The bridge view UImodification engine 1012 can make API calls to graphics services orlibraries in services layer 1006 or OS layer 1008 to perform all or someof its tasks described in reference to FIGS. 1-9. The bridge view UImodification engine 1012 can also make API calls to the applicationlayer 1002 to obtain the information necessary to define thumbnailimages of virtual workspaces, and determine the location and the contentof thumbnail images of virtual workspaces according to the descriptionsdisclosed in this specification. The bridge view UI modification engine1012 can also make API calls to services or libraries (e.g., textservices) in services layer 1006 or OS layer 1008 to perform all or someof its tasks.

Services layer 1006 can provide various graphics, animations and UIservices to support the graphical functions of the bridge view UImodification engine 1012 and applications in applications layer 1002. Insome implementations, services layer 1006 can also include a touch modelfor interpreting and mapping raw touch data from a touch sensitivedevice to touch events (e.g., gestures, rotations), which can beaccessed by applications using call conventions defined in a touch modelAPI. Services layer 1006 can also include communications software stacksfor wireless communications.

OS layer 1008 can be a complete operating system (e.g., MAC OS) or akernel (e.g., UNIX kernel). Hardware layer 1010 includes hardwarenecessary to perform the tasks described in reference to FIGS. 1-8,including but not limited to: processors or processing cores (includingapplication and communication baseband processors), dedicatedsignal/image processors, ASICs, graphics processors (e.g., GNUs), memoryand storage devices, communication ports and devices, peripherals, etc.

One or more Application Programming Interfaces (APIs) may be used insome implementations. An API is an interface implemented by a programcode component or hardware component (hereinafter “API-implementingcomponent”) that allows a different program code component or hardwarecomponent (hereinafter “API-calling component”) to access and use one ormore functions, methods, procedures, data structures, classes, and/orother services provided by the API-implementing component. An API candefine one or more parameters that are passed between the API-callingcomponent and the API-implementing component.

An API allows a developer of an API-calling component (which may be athird party developer) to leverage specified features provided by anAPI-implementing component. There may be one API-calling component orthere may be more than one such component. An API can be a source codeinterface that a computer system or program library provides in order tosupport requests for services from an application. An operating system(OS) can have multiple APIs to allow applications running on the OS tocall one or more of those APIs, and a service (such as a programlibrary) can have multiple APIs to allow an application that uses theservice to call one or more of those APIs. An API can be specified interms of a programming language that can be interpreted or compiled whenan application is built.

In some implementations, the API-implementing component may provide morethan one API, each providing a different view of or with differentaspects that access different aspects of the functionality implementedby the API-implementing component. For example, one API of anAPI-implementing component can provide a first set of functions and canbe exposed to third party developers, and another API of theAPI-implementing component can be hidden (not exposed) and provide asubset of the first set of functions and also provide another set offunctions, such as testing or debugging functions which are not in thefirst set of functions. In other implementations, the API-implementingcomponent may itself call one or more other components via an underlyingAPI and thus be both an API-calling component and an API-implementingcomponent.

An API defines the language and parameters that API-calling componentsuse when accessing and using specified features of the API-implementingcomponent. For example, an API-calling component accesses the specifiedfeatures of the API-implementing component through one or more API callsor invocations (embodied for example by function or method calls)exposed by the API and passes data and control information usingparameters via the API calls or invocations. The API-implementingcomponent may return a value through the API in response to an API callfrom an API-calling component. While the API defines the syntax andresult of an API call (e.g., how to invoke the API call and what the APIcall does), the API may not reveal how the API call accomplishes thefunction specified by the API call. Various API calls are transferredvia the one or more application programming interfaces between thecalling (API-calling component) and an API-implementing component.Transferring the API calls may include issuing, initiating, invoking,calling, receiving, returning, or responding to the function calls ormessages; in other words, transferring can describe actions by either ofthe API-calling component or the API-implementing component. Thefunction calls or other invocations of the API may send or receive oneor more parameters through a parameter list or other structure. Aparameter can be a constant, key, data structure, object, object class,variable, data type, pointer, array, list or a pointer to a function ormethod or another way to reference a data or other item to be passed viathe API.

Furthermore, data types or classes may be provided by the API andimplemented by the API-implementing component. Thus, the API-callingcomponent may declare variables, use pointers to, use or instantiateconstant values of such types or classes by using definitions providedin the API.

Generally, an API can be used to access a service or data provided bythe API-implementing component or to initiate performance of anoperation or computation provided by the API-implementing component. Byway of example, the API-implementing component and the API-callingcomponent may each be any one of an operating system, a library, adevice driver, an API, an application program, or other module (itshould be understood that the API-implementing component and theAPI-calling component may be the same or different type of module fromeach other). API-implementing components may in some cases be embodiedat least in part in firmware, microcode, or other hardware logic. Insome implementations, an API may allow a client program to use theservices provided by a Software Development Kit (SDK) library. In otherimplementations, an application or other client program may use an APIprovided by an Application Framework. In these implementations, theapplication or client program may incorporate calls to functions ormethods provided by the SDK and provided by the API, or use data typesor objects defined in the SDK and provided by the API. An ApplicationFramework may, in these implementations, provide a main event loop for aprogram that responds to various events defined by the Framework. TheAPI allows the application to specify the events and the responses tothe events using the Application Framework. In some implementations, anAPI call can report to an application the capabilities or state of ahardware device, including those related to aspects such as inputcapabilities and state, output capabilities and state, processingcapability, power state, storage capacity and state, communicationscapability, etc., and the API may be implemented in part by firmware,microcode, or other low level logic that executes in part on thehardware component.

The API-calling component may be a local component (i.e., on the samedata processing system as the API-implementing component) or a remotecomponent (i.e., on a different data processing system from theAPI-implementing component) that communicates with the API-implementingcomponent through the API over a network. It should be understood thatan API-implementing component may also act as an API-calling component(i.e., it may make API calls to an API exposed by a differentAPI-implementing component) and an API-calling component may also act asan API-implementing component by implementing an API that is exposed toa different API-calling component.

The API may allow multiple API-calling components written in differentprogramming languages to communicate with the API-implementing component(thus the API may include features for translating calls and returnsbetween the API-implementing component and the API-calling component);however, the API may be implemented in terms of a specific programminglanguage. An API-calling component can, in one embedment, call APIs fromdifferent providers such as a set of APIs from an OS provider andanother set of APIs from a plug-in provider and another set of APIs fromanother provider (e.g. the provider of a software library) or creator ofthe another set of APIs.

FIG. 10B is a block diagram 1020 illustrating an exemplary APIarchitecture, which may be used in the implementation of some theprocesses and user interface changes disclosed herein. As shown in FIG.10B, the API architecture 1020 includes the API-implementing component1022 (e.g., an operating system, a library, a device driver, an API, anapplication program, software or other module) that implements the API1024. The API 1024 specifies one or more functions, methods, classes,objects, protocols, data structures, formats and/or other features ofthe API-implementing component that may be used by the API-callingcomponent 1026. The API 1024 can specify at least one calling conventionthat specifies how a function in the API-implementing component receivesparameters from the API-calling component and how the function returns aresult to the API-calling component. The API-calling component 1026(e.g., an operating system, a library, a device driver, an API, anapplication program, software or other module), makes API calls throughthe API 1024 to access and use the features of the API-implementingcomponent 1022 that are specified by the API 1024. The API-implementingcomponent 1022 may return a value through the API 1024 to theAPI-calling component 1026 in response to an API call.

It will be appreciated that the API-implementing component 1022 mayinclude additional functions, methods, classes, data structures, and/orother features that are not specified through the API 1024 and are notavailable to the API-calling component 1026. It should be understoodthat the API-calling component 1026 may be on the same system as theAPI-implementing component 1022 or may be located remotely and accessesthe API-implementing component 1022 using the API 1024 over a network.While FIG. 10B illustrates a single API-calling component 1030interacting with the API 1024, it should be understood that otherAPI-calling components, which may be written in different languages (orthe same language) than the API-calling component 1026, may use the API1024.

The API-implementing component 1022, the API 1024, and the API-callingcomponent 1026 may be stored in a machine-readable medium, whichincludes any mechanism for storing information in a form readable by amachine (e.g., a computer or other data processing system). For example,a machine-readable medium includes magnetic disks, optical disks, randomaccess memory; read only memory, flash memory devices, etc.

In FIG. 10C (“Software Stack” 1030), an exemplary implementation 1030,applications can make calls to Service A 1032 or Service B 1034 usingseveral Service APIs (Service API A and Service API B) and to OperatingSystem (OS) 1036 using several OS APIs. Service A 1032 and service B1034 can make calls to OS 1036 using several OS APIs.

Note that the Service B 1034 has two APIs, one of which (Service B API A1038) receives calls from and returns values to Application A 1040 andthe other (Service B API B 1042) receives calls from and returns valuesto Application B 1044. Service A 1032 (which can be, for example, asoftware library) makes calls to and receives returned values from OSAPI A 1046, and Service B 1034 (which can be, for example, a softwarelibrary) makes calls to and receives returned values from both OS API A1046 and OS API B 1048. Application B 1044 makes calls to and receivesreturned values from OS API B 1048.

Exemplary Device Architecture

FIG. 11 is a block diagram of exemplary hardware architecture 1100 for adevice implementing the bridge view of virtual workspaces processes andinterfaces described in reference to FIGS. 1-10. The device can includememory interface 1102, one or more data processors, image processorsand/or processors 1104, and peripherals interface 1106. Memory interface1102, one or more processors 1104 and/or peripherals interface 1106 canbe separate components or can be integrated in one or more integratedcircuits. The various components in the device, for example, can becoupled by one or more communication buses or signal lines.

Sensors, devices, and subsystems can be coupled to peripherals interface1106 to facilitate multiple functionalities. For example, motion sensor1110, light sensor 1112, and proximity sensor 1114 can be coupled toperipherals interface 1106 to facilitate orientation, lighting, andproximity functions of the mobile device. Location processor 1115 (e.g.,GPS receiver) can be connected to peripherals interface 1106 to providegeopositioning. Electronic magnetometer 1116 (e.g., an integratedcircuit chip) can also be connected to peripherals interface 1106 toprovide data that can be used to determine the direction of magneticNorth. Thus, electronic magnetometer 1116 can be used as an electroniccompass. Accelerometer 1117 can also be connected to peripheralsinterface 1106 to provide data that can be used to determine change ofspeed and direction of movement of the mobile device.

Camera subsystem 1120 and an optical sensor 1122, e.g., a chargedcoupled device (CCD) or a complementary metal-oxide semiconductor (CMOS)optical sensor, can be utilized to facilitate camera functions, such asrecording photographs and video clips.

Communication functions can be facilitated through one or more wirelesscommunication subsystems 1124, which can include radio frequencyreceivers and transmitters and/or optical (e.g., infrared) receivers andtransmitters. The specific design and implementation of thecommunication subsystem 1124 can depend on the communication network(s)over which a mobile device is intended to operate. For example, a mobiledevice can include communication subsystems 1124 designed to operateover a GSM network, a GPRS network, an EDGE network, a Wi-Fi or WiMaxnetwork, and a Bluetooth network. In particular, the wirelesscommunication subsystems 1124 can include hosting protocols such thatthe mobile device can be configured as a base station for other wirelessdevices.

Audio subsystem 1126 can be coupled to a speaker 1128 and a microphone1130 to facilitate voice-enabled functions, such as voice recognition,voice replication, digital recording, and telephony functions.

I/O subsystem 1140 can include touch screen controller 1142 and/or otherinput controller(s) 1144. Touch-screen controller 1142 can be coupled toa touch screen 1146 or pad. Touch screen 1146 and touch screencontroller 1142 can, for example, detect contact and movement or breakthereof using any of a plurality of touch sensitivity technologies,including but not limited to capacitive, resistive, infrared, andsurface acoustic wave technologies, as well as other proximity sensorarrays or other elements for determining one or more points of contactwith touch screen 1146.

Other input controller(s) 1144 can be coupled to other input/controldevices 1148, such as one or more buttons, rocker switches, thumb-wheel,infrared port, USB port, and/or a pointer device such as a stylus. Theone or more buttons (not shown) can include an up/down button for volumecontrol of speaker 1128 and/or microphone 1130.

In one implementation, a pressing of the button for a first duration maydisengage a lock of the touch screen 1146; and a pressing of the buttonfor a second duration that is longer than the first duration may turnpower to the device on or off. The user may be able to customize afunctionality of one or more of the buttons. The touch screen 1146 can,for example, also be used to implement virtual or soft buttons and/or akeyboard.

In some implementations, the device can present recorded audio and/orvideo files, such as MP3, AAC, and MPEG files. In some implementations,the device can include the functionality of an MP3 player, such as aniPod™. The device may, therefore, include a pin connector that iscompatible with the iPod. Other input/output and control devices canalso be used.

Memory interface 1102 can be coupled to memory 1150. Memory 1150 caninclude high-speed random access memory and/or non-volatile memory, suchas one or more magnetic disk storage devices, one or more opticalstorage devices, and/or flash memory (e.g., NAND, NOR). Memory 1150 canstore operating system 1152, such as Darwin, RTXC, LINUX, UNIX, OS X,WINDOWS, or an embedded operating system such as VxWorks. Operatingsystem 1152 may include instructions for handling basic system servicesand for performing hardware dependent tasks. In some implementations,operating system 1152 can include a kernel (e.g., UNIX kernel).

Memory 1150 may also store communication instructions 1154 to facilitatecommunicating with one or more additional devices, one or more computersand/or one or more servers. Memory 1150 may include graphical userinterface instructions 1156 to facilitate graphic user interfaceprocessing; sensor processing instructions 1158 to facilitatesensor-related processing and functions; phone instructions 1160 tofacilitate phone-related processes and functions; electronic messaginginstructions 1162 to facilitate electronic-messaging related processesand functions; web browsing instructions 1164 to facilitate webbrowsing-related processes and functions; media processing instructions1166 to facilitate media processing-related processes and functions;GPS/Navigation instructions 1168 to facilitate GPS andnavigation-related processes and instructions; and camera instructions1170 to facilitate camera-related processes and functions. The memory1150 may also store other software instructions (not shown), such assecurity instructions, web video instructions to facilitate webvideo-related processes and functions, and/or web-shopping instructionsto facilitate web shopping-related processes and functions. In someimplementations, the media processing instructions 1166 are divided intoaudio processing instructions and video processing instructions tofacilitate audio processing-related processes and functions and videoprocessing-related processes and functions, respectively. An activationrecord and International Mobile Equipment Identity (IMEI) or similarhardware identifier can also be stored in memory 1150. Memory 1150 canalso include other instructions 1172.

Each of the above identified instructions and applications cancorrespond to a set of instructions for performing one or more functionsdescribed above. These instructions need not be implemented as separatesoftware programs, procedures, or modules. Memory 1150 can includeadditional instructions or fewer instructions. Furthermore, variousfunctions of the mobile device may be implemented in hardware and/or insoftware, including in one or more signal processing and/or applicationspecific integrated circuits.

The features described can be implemented in digital electroniccircuitry, or in computer hardware, firmware, software, or incombinations of them. The features can be implemented in a computerprogram product tangibly embodied in an information carrier, e.g., in amachine-readable storage device, for execution by a programmableprocessor; and method steps can be performed by a programmable processorexecuting a program of instructions to perform functions of thedescribed implementations by operating on input data and generatingoutput.

The described features can be implemented advantageously in one or morecomputer programs that are executable on a programmable system includingat least one programmable processor coupled to receive data andinstructions from, and to transmit data and instructions to, a datastorage system, at least one input device, and at least one outputdevice. A computer program is a set of instructions that can be used,directly or indirectly, in a computer to perform a certain activity orbring about a certain result. A computer program can be written in anyform of programming language (e.g., Objective-C, Java), includingcompiled or interpreted languages, and it can be deployed in any form,including as a stand-alone program or as a module, component,subroutine, or other unit suitable for use in a computing environment.

Suitable processors for the execution of a program of instructionsinclude, by way of example, both general and special purposemicroprocessors, and the sole processor or one of multiple processors orcores, of any kind of computer. Generally, a processor will receiveinstructions and data from a read-only memory or a random access memoryor both. The essential elements of a computer are a processor forexecuting instructions and one or more memories for storing instructionsand data. Generally, a computer will also include, or be operativelycoupled to communicate with, one or more mass storage devices forstoring data files; such devices include magnetic disks, such asinternal hard disks and removable disks; magneto-optical disks; andoptical disks. Storage devices suitable for tangibly embodying computerprogram instructions and data include all forms of non-volatile memory,including by way of example semiconductor memory devices, such as EPROM,EEPROM, and flash memory devices; magnetic disks such as internal harddisks and removable disks; magneto-optical disks; and CD-ROM and DVD-ROMdisks. The processor and the memory can be supplemented by, orincorporated in, ASICs (application-specific integrated circuits).

To provide for interaction with a user, the features can be implementedon a computer having a display device such as a CRT (cathode ray tube)or LCD (liquid crystal display) monitor for displaying information tothe user and a keyboard, a mouse or a trackball, or a pointing device(e.g., a finger or stylus on a touch-sensitive surface ortouch-sensitive display) by which the user can provide input to thecomputer.

The features can be implemented in a computer system that includes aback-end component, such as a data server, or that includes a middlewarecomponent, such as an application server or an Internet server, or thatincludes a front-end component, such as a client computer having agraphical user interface or an Internet browser, or any combination ofthem. The components of the system can be connected by any form ormedium of digital data communication such as a communication network.Examples of communication networks include, e.g., a LAN, a WAN, and thecomputers and networks forming the Internet.

The computer system can include clients and servers. A client and serverare generally remote from each other and typically interact through anetwork. The relationship of client and server arises by virtue ofcomputer programs running on the respective computers and having aclient-server relationship to each other.

One or more features or steps as disclosed herein can be implementedusing an API. An API can define on or more parameters that are passedbetween a calling application and other software code (e.g., anoperating system, library routine, function) that provides a service,that provides data, or that performs an operation or a computation.

The API can be implemented as one or more calls in program code thatsend or receive one or more parameters through a parameter list or otherstructure based on a call convention defined in an API specificationdocument. A parameter can be a constant, a key, a data structure, anobject, an object class, a variable, a data type, a pointer, an array, alist, or another call. API calls and parameters can be implemented inany programming language. The programming language can define thevocabulary and calling convention that a programmer will employ toaccess functions supporting the API.

In some implementations, an API call can report to an application thecapabilities of a device running the application, such as inputcapability, output capability, processing capability, power capability,communications capability, etc.

A number of implementations have been described. Nevertheless, it willbe understood that various modifications may be made. For example,elements of one or more implementations may be combined, deleted,modified, or supplemented to form further implementations. As yetanother example, the logic flows depicted in the figures do not requirethe particular order shown, or sequential order, to achieve desirableresults. In addition, other steps may be provided, or steps may beeliminated, from the described flows, and other components may be addedto, or removed from, the described systems. Accordingly, otherimplementations are within the scope of the present disclosure.

What is claimed is:
 1. A method comprising: at a computer system with adisplay and one or more input devices: concurrently displaying, on thedisplay: a plurality of workspace images in a user interface thatcorrespond to different virtual workspaces that are available to a userof the computer system; and a view of a first virtual workspaceincluding a representation of a window that is associated with the firstvirtual workspace; while concurrently displaying, on the display, theplurality of workspace images and the view of the first virtualworkspace, receiving, via the one or more input devices, user inputindicating a movement of the representation of the window from the viewof the first virtual workspace onto a respective workspace image of theplurality of workspace images, wherein the respective workspace imagecorresponds to a second virtual workspace that is different from thefirst virtual workspace, and the representation of the window is largerthan the respective workspace image; and in response to receiving theinput, via the one or more input devices, indicating movement of therepresentation of the window onto the respective workspace image,scaling down, on the display, the representation of the window to fitwithin the respective workspace image that is displayed on the display.2. The method of claim 1, further comprising, at the computer system:progressively scaling down, on the display, the representation of thewindow as the representation of the window is moved near the respectiveworkspace image.
 3. The method of claim 1, further comprising, at thecomputer system: detecting when the representation of the window ismoved across a threshold on the user interface; and in response to thedetecting, scaling down, on the display, the representation of thewindow to fit within the respective workspace image.
 4. A methodperformed by one or more processors executing on a computer system witha display and one or more input devices, the method comprising: at thecomputer system: concurrently displaying, on the display: a plurality ofworkspace images in a user interface that correspond to differentvirtual workspaces available to a user of the computer system; and aview of a first virtual workspace including a representation of a windowcluster that is associated with the first virtual workspace; whileconcurrently displaying, on the display, the plurality of workspaceimages and the view of the first virtual workspace, receiving, via theone or more input devices, user input indicating a movement of therepresentation of the window cluster from the view of the first virtualworkspace onto a respective workspace image of the plurality ofworkspace images, wherein the respective workspace image corresponds toa second virtual workspace that is different from the first virtualworkspace, and the representation of the window cluster is larger thanthe respective workspace image; and in response to receiving the input,via the one or more input devices, indicating the movement of therepresentation of the window cluster onto the respective workspaceimage, scaling down, on the display, the representation of the windowcluster to fit within the respective workspace image that is displayedon the display.
 5. The method of claim 4, further comprising, at thecomputer system: progressively scaling down, on the display, therepresentation of the window cluster as the representation of the windowcluster is moved near the respective workspace image.
 6. The method ofclaim 4, further comprising, at the computer system: detecting when therepresentation of the window cluster is moved across a threshold on theuser interface; and in response to the detecting, scaling down, on thedisplay, the representation of the window cluster to fit within therespective workspace image.
 7. The method of claim 4, wherein therepresentation of the window cluster includes a plurality of applicationwindows associated with a single application.
 8. A method performed byone or more processors executing on a computer system with a display andone or more input devices, the method comprising: at the computersystem: concurrently displaying, on the display: a plurality ofworkspace images in a user interface that correspond to differentvirtual workspaces that are available to a user of the computer system;a placeholder image that does not have a corresponding virtualworkspace; and a view of a first virtual workspace including arepresentation of a window that is associated with the first virtualworkspace; while concurrently displaying, on the display, the pluralityof workspace images, the placeholder image, and the view of the firstvirtual workspace, receiving, via the one or more input devices, userinput indicating a movement of the representation of the window from theview of the first virtual workspace onto the placeholder image, whereinthe representation of the window is larger than the placeholder image;and in response to receiving the input, via the one or more inputdevices, indicating the movement of the representation of the windowonto the placeholder image: scaling down, on the display, therepresentation of the window to fit within the placeholder image; andgenerating a new virtual workspace and corresponding workspace imagethat includes the representation of the window.
 9. The method of claim8, further comprising, at the computer system: before the concurrentlydisplaying the plurality of workspace images, the placeholder image, andthe view of the first virtual workspace: detecting an initiation of themovement of the representation of the window; and presenting, on thedisplay, the placeholder image in response to the detecting.
 10. Anon-transitory computer-readable medium including one or more sequencesof instructions which, when executed by one or more processors of acomputer system with a display and one or more input devices, causes: atthe computer system: concurrently displaying, on the display: aplurality of workspace images in a user interface that correspond todifferent virtual workspaces that are available to a user of thecomputer system; and a view of a first virtual workspace including arepresentation of a window that is associated with the first virtualworkspace; while concurrently displaying, on the display, the pluralityof workspace images and the view of the first virtual workspace,receiving, via the one or more input devices, user input indicating amovement of the representation of the window from the view of the firstvirtual workspace onto a respective workspace image of the plurality ofworkspace images, wherein the respective workspace image corresponds toa second virtual workspace that is different from the first virtualworkspace, and the representation of the window is larger than therespective workspace image; and in response to receiving the input, viathe one or more input devices, indicating movement of the representationof the window onto the respective workspace image, scaling down, on thedisplay, the representation of the window to fit within the respectiveworkspace image that is displayed on the display.
 11. The non-transitorycomputer-readable medium of claim 10, where the instructions furthercause, at the computer system: progressively scaling down, on thedisplay, the representation of the window as the representation of thewindow is moved near the respective workspace image.
 12. Thenon-transitory computer-readable medium of claim 10, where theinstructions further cause, at the computer system: detecting when therepresentation of the window is moved across a threshold on the userinterface; and in response to the detecting, scaling down, on thedisplay, the representation of the window to fit within the respectiveworkspace image.
 13. A non-transitory computer-readable medium includingone or more sequences of instructions which, when executed by one ormore processors of a computer system with a display and one or moreinput devices, causes: at the computer system: concurrently displaying,on the display: a plurality of workspace images in a user interface thatcorrespond to different virtual workspaces available to a user of thecomputer system; and a view of a first virtual workspace including arepresentation of a window cluster that is associated with the firstvirtual workspace; while concurrently displaying, on the display, theplurality of workspace images and the view of the first virtualworkspace, receiving, via the one or more input devices, user inputindicating a movement of the representation of the window cluster fromthe view of the first virtual workspace onto a respective workspaceimage of the plurality of workspace images, wherein the respectiveworkspace image corresponds to a second virtual workspace that isdifferent from the first virtual workspace, and the representation ofthe window cluster is larger than the respective workspace image; and inresponse to receiving the input, via the one or more input devices,indicating the movement of the representation of the window cluster ontothe respective workspace image, scaling down, on the display, therepresentation of the window cluster to fit within the respectiveworkspace image that is displayed on the display.
 14. The non-transitorycomputer-readable medium of claim 13, where the instructions furthercause, at the computer system: progressively scaling down, on thedisplay, the representation of the window cluster as the representationof the window cluster is moved near the respective workspace image. 15.The non-transitory computer-readable medium of claim 13, where theinstructions further cause, at the computer system: detecting when therepresentation of the window cluster is moved across a threshold on theuser interface; and in response to the detecting, scaling down, on thedisplay, the representation of the window cluster to fit within therespective workspace image.
 16. The non-transitory computer-readablemedium of claim 13, wherein the representation of the window clusterincludes a plurality of application windows associated with a singleapplication.
 17. A non-transitory computer-readable medium including oneor more sequences of instructions which, when executed by one or moreprocessors of a computer system with a display and one or more inputdevices, causes: at the computer system: concurrently displaying, on thedisplay: a plurality of workspace images in a user interface thatcorrespond to different virtual workspaces that are available to a userof the computer system; a placeholder image that does not have acorresponding virtual workspace; and a view of a first virtual workspaceincluding a representation of a window that is associated with the firstvirtual workspace; while concurrently displaying, on the display, theplurality of workspace images, the placeholder image, and the view ofthe first virtual workspace, receiving, via the one or more inputdevices, user input indicating a movement of the representation of thewindow from the view of the first virtual workspace onto the placeholderimage, wherein the representation of the window is larger than theplaceholder image; and in response to receiving the input, via the oneor more input devices, indicating the movement of the representation ofthe window onto the placeholder image: scaling down, on the display, therepresentation of the window to fit within the placeholder image; andgenerating a new virtual workspace and corresponding workspace imagethat includes the representation of the window.
 18. The non-transitorycomputer-readable medium of claim 17, where the instructions furthercause, at the computer system: before the concurrently displaying theplurality of workspace images, the placeholder image, and the view ofthe first virtual workspace: detecting an initiation of the movement ofthe representation of the window; and presenting, on the display, theplaceholder image in response to the detecting.
 19. A computer systemcomprising: a display; one or more input devices; one or moreprocessors; and a computer-readable medium including one or moresequences of instructions which, when executed by the one or moreprocessors, causes: at the computer system: concurrently displaying, onthe display: a plurality of workspace images in a user interface thatcorrespond to different virtual workspaces that are available to a userof the computer system; and a view of a first virtual workspaceincluding a representation of a window that is associated with the firstvirtual workspace; while concurrently displaying, on the display, theplurality of workspace images and the view of the first virtualworkspace, receiving, via the one or more input devices, user inputindicating a movement of the representation of the window from the viewof the first virtual workspace onto a respective workspace image of theplurality of workspace images, wherein the respective workspace imagecorresponds to a second virtual workspace that is different from thefirst virtual workspace, and the representation of the window is largerthan the respective workspace image; and in response to receiving theinput, via the one or more input devices, indicating movement of therepresentation of the window onto the respective workspace image,scaling down, on the display, the representation of the window to fitwithin the respective workspace image that is displayed on the display.20. The computer system of claim 19, where the instructions furthercause, at the computer system: progressively scaling down, on thedisplay, the representation of the window as the representation of thewindow is moved near the respective workspace image.
 21. The computersystem of claim 19, where the instructions further cause, at thecomputer system: detecting when the representation of the window clusteris moved across a threshold on the user interface; and in response tothe detecting, scaling down, on the display, the representation of thewindow cluster to fit within the respective workspace image.
 22. Acomputer system comprising: a display; one or more input devices; one ormore processors; and a computer-readable medium including one or moresequences of instructions which, when executed by the one or moreprocessors, causes: at the computer system: concurrently displaying, onthe display: a plurality of workspace images in a user interface thatcorrespond to different virtual workspaces available to a user of thecomputer system; and a view of a first virtual workspace including arepresentation of a window cluster that is associated with the firstvirtual workspace; while concurrently displaying, on the display, theplurality of workspace images and the view of the first virtualworkspace, receiving, via the one or more input devices, user inputindicating a movement of the representation of the window cluster fromthe view of the first virtual workspace onto a respective workspaceimage of the plurality of workspace images, wherein the respectiveworkspace image corresponds to a second virtual workspace that isdifferent from the first virtual workspace, and the representation ofthe window cluster is larger than the respective workspace image; and inresponse to receiving the input, via the one or more input devices,indicating the movement of the representation of the window cluster ontothe respective workspace image, scaling down, on the display, therepresentation of the window cluster to fit within the respectiveworkspace image that is displayed on the display.
 23. The computersystem of claim 22, where the instructions further cause, at thecomputer system: progressively scaling down, on the display, therepresentation of the window cluster as the representation of the windowcluster is moved near the respective workspace image.
 24. The computersystem of claim 22, where the instructions further cause, at thecomputer system: detecting when the representation of the window clusteris moved across a threshold on the user interface; and in response tothe detecting, scaling down, on the display, the representation of thewindow cluster to fit within the respective workspace image.
 25. Thecomputer system of claim 22, wherein the representation of the windowcluster includes a plurality of application windows associated with asingle application.
 26. A computer system comprising: a display; one ormore input devices; one or more processors; and a computer-readablemedium including one or more sequences of instructions which, whenexecuted by one or more processors, causes: at the computer system:concurrently displaying, on the display: a plurality of workspace imagesin a user interface that correspond to different virtual workspaces thatare available to a user of the computer system; a placeholder image thatdoes not have a corresponding virtual workspace; and a view of a firstvirtual workspace including a representation of a window that isassociated with the first virtual workspace; while concurrentlydisplaying, on the display, the plurality of workspace images, theplaceholder image, and the view of the first virtual workspace,receiving, via the one or more input devices, user input indicating amovement of the representation of the window from the view of the firstvirtual workspace onto the placeholder image, wherein the representationof the window is larger than the placeholder image; and in response toreceiving the input, via the one or more input devices, indicating themovement of the representation of the window onto the placeholder image:scaling down, on the display, the representation of the window to fitwithin the placeholder image; and generating a new virtual workspace andcorresponding workspace image that includes the representation of thewindow.
 27. The computer system of claim 26, where the instructionsfurther cause, at the computer system: before the concurrentlydisplaying the plurality of workspace images, the placeholder image, andthe view of the first virtual workspace: detecting an initiation of themovement of the representation of the window; and presenting, on thedisplay, the placeholder image in response to the detecting.